<template>
  <a-select
    v-model="value"
    :virtual-list-props="props.component.virtualListProps"
    :placeholder="props.component.searchPlaceholder ?? `请选择${props.component.title}`"
    allow-clear
    allow-search
    :scrollbar="props.component.scrollbar"
    :format-label="props.component.formatLabel"
    :max-tag-count="1"
    :options="dicts[props.component.dataIndex]"
    :multiple="props.component.multiple || ['transfer', 'checkbox'].includes(props.component.formType)"
    :show-extra-options="false"
    :fallback-option="handlerFallback"
    :loading="loading"
    @change="handlerChangeEvent"
  >
    <template #header v-if="props.component.multiple && props.component.multipleTools">
      <div style="padding: 6px 12px">
        <a-space fill>
          <a-checkbox
            v-if="isBoolean(props.component.multipleTools) || props.component.multipleTools.selectAll"
            :model-value="checkedAll"
            :indeterminate="indeterminate"
            :disabled="loading"
            @change="handleSelectAll"
            >全选/清除
          </a-checkbox>

          <a-button
            v-if="isBoolean(props.component.multipleTools) || props.component.multipleTools.inverse"
            class="ml-2"
            size="mini"
            type="outline"
            :disabled="loading"
            @click="handleInverse"
            >反选
          </a-button>

          <a-popover
            :content-style="{ padding: '0px', width: '256px' }"
            position="rt"
            trigger="click"
            v-if="isBoolean(props.component.multipleTools) || props.component.multipleTools.showSelectAll"
          >
            <a-button class="ml-2" size="mini">已选 {{ value.length }}</a-button>
            <template #title>
              <a-space fill style="padding: 12px 12px 8px 12px">
                <a-button :disabled="loading || !value.length" size="mini" status="danger" @click="value = []"
                  >清空 {{ value.length }}
                </a-button>
                <a-input-search v-model="keyword" size="mini" allow-clear />
              </a-space>
            </template>
            <template #content>
              <a-scrollbar style="height: 200px; overflow: auto">
                <a-checkbox-group
                  v-if="(value.length && keyword === '') || Object.keys(filteredOptions).length > 0"
                  direction="vertical"
                  v-model="value"
                >
                  <div v-for="item in filteredOptions" class="select-all-options">
                    <a-checkbox :value="item.value">{{ item.label }}</a-checkbox>
                  </div>
                </a-checkbox-group>
                <a-empty v-else />
              </a-scrollbar>
            </template>
          </a-popover>
        </a-space>
      </div>
    </template>
    <template #footer v-if="props.component?.dict?.openPage ?? false">
      <div class="flex justify-center">
        <a-pagination
          class="p-2"
          size="mini"
          :total="dataTotal"
          :page-size="props.component.dict.pageOption.pageSize"
          :disabled="loading"
          simple
          @change="handlePage"
        >
          <template #page-item-step="{ type }">
            <div>{{ type === "previous" ? "上一页" : "下一页" }}</div>
          </template>
        </a-pagination>
      </div>
    </template>
  </a-select>
</template>

<script setup>
import { handlerCascader, loadDict } from "@/components/MaForm/types/networkRequest";
import { get, set, isUndefined, xor, isObject, isBoolean } from "lodash";

const props = defineProps({
  component: Object
});
const searchForm = inject("searchForm");
const columns = inject("columns");
const dicts = inject("dicts");
const dataTotal = ref(0);
const dictIndex = props.component.dataIndex;
const loading = ref(false);
const optionMap = ref({});
const keyword = ref("");

let defaultValue;

if (props.component.multiple === true) {
  defaultValue = props.component.searchDefaultValue ?? [];
} else {
  defaultValue = props.component.searchDefaultValue ?? "";
}

if (isUndefined(props.component.multipleTools)) props.component.multipleTools = true;

if (isObject(props.component.dict)) {
  props.component.dict.pageOption = {
    page: 1,
    pageSize: props.component?.dict?.pageOption?.pageSize ?? props.component?.dict?.pageSize ?? 15
  };
}

const value = ref(get(searchForm.value, props.component.dataIndex, defaultValue));
set(searchForm.value, props.component.dataIndex, value.value);

const handleSelectAll = status => {
  if (isUndefined(value.value)) {
    value.value = [];
  }
  if (status) {
    const currentSet = new Set(value.value);
    const newValues = dicts.value[dictIndex].filter(item => !currentSet.has(item.value)).map(item => item.value);
    value.value = [...value.value, ...newValues];
  } else {
    value.value = [];
  }
};

const handleInverse = () => {
  if (isUndefined(value.value)) {
    value.value = [];
  }
  const ids = [];
  dicts.value[dictIndex].map(item => ids.push(item.value));
  value.value = xor(value.value, ids);
};

const handlePage = async page => {
  loading.value = true;
  props.component.dict.pageOption.page = page;
  await loadDict(dicts.value, props.component);
  loading.value = false;
};

const handlerFallback = key => {
  return optionMap.value[key] || key;
};

watch(
  () => get(searchForm.value, props.component.dataIndex),
  vl => (value.value = vl)
);
watch(
  () => value.value,
  v => {
    if (props.component.multiple) {
      v.forEach(k => {
        if (!optionMap.value[k]) {
          optionMap.value[k] = dicts.value[dictIndex].find(i => i.value === k);
        }
      });
      for (const k in optionMap.value) {
        if (!v.includes(k)) delete optionMap.value[k];
      }
    }
    set(searchForm.value, props.component.dataIndex, v);
  }
);
watch(
  () => dicts.value[dictIndex],
  async v => {
    dataTotal.value = v?.pageInfo?.total || 0;
  }
);

const checkedAll = computed(() => {
  const { multiple, multipleTools } = props.component;
  const currentDicts = dicts.value[dictIndex];

  if (multiple && multipleTools && currentDicts) {
    return currentDicts.every(item => value.value.includes(item.value));
  }

  return false;
});

const filteredOptions = computed(() => {
  const { multiple, multipleTools } = props.component;
  if (multiple && multipleTools && keyword.value !== "") {
    const lowerCaseKeyword = keyword.value.toLowerCase();
    return Object.values(optionMap.value).filter(option => option.label.toLowerCase().includes(lowerCaseKeyword));
  }
  return optionMap.value;
});

const indeterminate = computed(() => {
  if (props.component.multiple && props.component.multipleTools && checkedAll.value === false) {
    const currentDicts = dicts.value[dictIndex];
    return currentDicts.some(item => value.value.includes(item.value));
  }
  return false;
});

const handlerChangeEvent = value => {
  handlerCascader(value, props.component, columns.value, dicts.value, searchForm.value);
};

onMounted(() => {});
</script>
<style lang="less" scoped>
.arco-checkbox-group {
  width: 100%;

  .select-all-options {
    width: 100%;
    height: 36px;
    padding: 0 15px 0 7px;
    color: inherit;
    background-color: transparent;
    transition: all 0.1s cubic-bezier(0, 0, 1, 1);

    ::v-deep(.arco-checkbox .arco-checkbox-label) {
      height: 36px;
      line-height: 36px;
      overflow: hidden;
      white-space: nowrap;
      text-overflow: ellipsis;
    }

    &:hover {
      color: var(--color-text-1);
      background-color: var(--color-fill-2);
    }
  }
}
</style>
